The crystal structures and infra-red spectra of barium and strontium nitrates

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Abstract
It is shown that the unit-cell (factor group) analysis of the infra-red and Raman spectra of the isomorphous anhydrous nitrates of barium and strontium is superior to that of the site-group method and that it is also in favour of the non-centrosymmetric space group T4–P21x3 which was recently proposed by Birnstock. An analysis of the combination and overtone modes of Ba(NO3)2 and Sr(NO3)2 is also given in terms of the Birnstock space group.

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